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清华大学学报(自然科学版)  2018, Vol. 58 Issue (7): 677-683    DOI: 10.16511/j.cnki.qhdxxb.2018.26.030
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
Q&P980超高强钢的循环加载性能和微观组织表征
韩飞, 周子浩, 王允
北方工业大学 机械与材料工程学院, 北京 100144
Cyclic loading behavior and microstructure characterization of ultra-high strength steel Q&P980
HAN Fei, ZHOU ZiHao, WANG Yun
School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China
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摘要 为研究超高强钢的循环加载性能,以淬火配分(quenching & partitioning,Q&P)980超高强钢为研究对象,通过循环次数、循环位置以及各向异性的拉伸实验,得到真实应力应变曲线,分析卸载环的性质,对其力学性能进行准确表征,再通过金相显微镜、X射线衍射(X-ray diffraction,XRD)等检测手段,分析相应的微观组织变化。发现随着形变程度的增加,卸载和重新加载斜率不断降低,回弹应变、延伸率和强度不断增加,相应的奥氏体含量不断下降,即具有相变诱导塑性(transformation induced plasticity,TRIP)效应。当变形程度相近时,随着循环次数的增加,回弹应变不是持续增加,而是在循环次数增加到10时出现回弹应变减小的情况。循环加载过程会减弱板材的各向异性,但是对弹性模量和回弹的影响不大。
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韩飞
周子浩
王允
关键词 超高强钢反复拉伸卸载拉伸试验微观组织    
Abstract:The true stress-strain curve for ultra-high strength steel Q&P980 is obtained through cyclic loading of the ultra-high strength steel in terms of the number of cycles, cyclic position and anisotropy of the cyclic tensile test. The properties of the unloading ring were also analyzed to accurately characterize the mechanical properties. A metallographic microscope using X-ray diffraction (XRD) was then used to study the microstructural changes. The results show that increasing the deformation reduced the slope of the unloading and reloading curves. In addition, reducing the austenite content increased the springback strain, elongation and strength, which is called the transformation induced plasticity (TRIP) effect. For similar amounts of deformation, increasing the number of cycles did not increase the springback strain but reduce it when the cycle number increased to 10. The cyclic loading weakens the sheet anisotropy, but has little effect on the elastic modulus and springback.
Key wordsultra-high strength steel    repeated tensile unloading    tensile tests    microstructure
收稿日期: 2018-01-05      出版日期: 2018-07-15
基金资助:国家自然科学基金资助项目50905001);国家自然科学基金和上海宝钢集团公司联合资助项目(51074204);北京市自然科学基金资助项目(3112010);北京市青年拔尖人才项目(2014000026833ZK12)
引用本文:   
韩飞, 周子浩, 王允. Q&P980超高强钢的循环加载性能和微观组织表征[J]. 清华大学学报(自然科学版), 2018, 58(7): 677-683.
HAN Fei, ZHOU ZiHao, WANG Yun. Cyclic loading behavior and microstructure characterization of ultra-high strength steel Q&P980. Journal of Tsinghua University(Science and Technology), 2018, 58(7): 677-683.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2018.26.030  或          http://jst.tsinghuajournals.com/CN/Y2018/V58/I7/677
  表1 Q&P980超高强钢的部分化学成分
  图1 拉伸试样尺寸(单位: mm)
  表2 循环次数实验
  表3 各向异性实验
  图2 循环加载过程分析
  图3 循环8次卸载环
  图4 放大倍数为1000的金相照片
  图5 不同应变下的 XRD对比图
  图6 循环次数相同而拉伸应变不同的应变曲线
  图7 拉伸位移到达6mm 时的卸载环
  图8 拉伸位移到达12mm 时的卸载环
  图9 与轧制方向成45°的6mm 处卸载环
  图10 各向异性的真实应力应变曲线
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